Doing the interface between your computer (or player as MIDILECTOR Midi) and your mechanical musical instrument (organ, piano, accordion ..). You plug a MIDI cable / USB from the computer to the board MIDI input board. Connect an electromagnet at each board output. These solenoids open valves or pull on levers to produce notes on the instrument. The board job is to switch on or off the electromagnet corresponding to the read note in the MIDI file on the computer or Sd player.
You can also drive DC lights, within the board limits. 220 volt lights can be driven by use of relays.